Canon FACSIMILE BASIC 2000 Service Manual page 7

CHAPTER 6 FACSIMILE SYSTEM
INTRODUCTION..........................................................................6-2
SCNT BOARD..............................................................................6-3
NCU BOARD................................................................................6-5
OPCNT BOARD .........................................................................6-18
FLOW OF IMAGE SIGNALS......................................................6-22
POWER SUPPLY UNIT .............................................................6-24
G4CNT BOARD .........................................................................6-32
APPENDIX
TRANSMISSION LINES OF TELEPHONE LINES ..................... A-2
CHARACTERISTICS OF TELEPHONE LINE (ANALOG) .......... A-4
Option Signals ......................................................................5-106
Structure of Binary Signals ...................................................5-107
Example of G3 Procedures ..................................................5-122
ECM Communications ..........................................................5-123
System Control Section ............................................................6-3
Communications Control Section .............................................6-4
Reading Control Section...........................................................6-4
Printer Control Section .............................................................6-4
Off-hook Detection....................................................................6-6
Formation of DC Loop ..............................................................6-6
Detection of Calling Identification (CI) ......................................6-9
Line Signal Monitor .................................................................6-10
Dial Control .............................................................................6-11
2-wire/4-wire Conversion ........................................................6-12
Protective Circuits...................................................................6-12
Telephone Connection Control ...............................................6-14
Relay Operations ....................................................................6-17
Detection of Button Input ........................................................6-18
LED Lighting Control ..............................................................6-21
Display Indication Control .......................................................6-21
Transmission ..........................................................................6-22
Reception ...............................................................................6-23
Switching Regulator................................................................6-24
Configuration of Power Supply Unit on a Facsimile ...............6-31
Telephone Line Band .............................................................. A-4
Characteristics of Telephone Network Components ............... A-5
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